We do not expect that the LP and SP model can explain the observed properties of \(X(3872)\)  by
treating it as the \(\chi _{c1}(2P)\)  state. But as a test of the potential model calculations we
consider \(X(3872)\)  as the \(\chi _{c1}(2P)\)  state and calculate its strong decays into \(D^0D^{*0}\) .
It shows that a strong coupling can be extracted and the dominance of the partial widths of
\(X(3872)\rightarrow D^0D^{*0}\)  (if the input mass is higher than the threshold)
is consistent with the experimental observations.
We also predict the width of \(X(3872)\)  by using its physical mass \(3871.69\pm 0.17\)  MeV [1]}
in the \(^3P_0\)  model, which gives a decay width of \(\Gamma <7\)  MeV.
It turns out to be that the decay width is very sensitive to the mass of \(X(3872)\) .
As the physical mass of \(X(3872)\)  is very close to the \(D^0\bar{D}^{*0}\)  threshold,
the line shape of \(D^{*0}\)  should be taken into account.
This effect can be included by using the quasi-two-body decay formula [2]}, [3]}, [4]}, [5]}, [6]}

[D0(D)D*0] =20kmaxdkk2 J,L| MJL(X(3872)D0D0*)|2
